Teeth and microbes

 A. Which one is correct ?

1. Yellow substance on teeth is called-

a. dentine  

b. tar tar  

c. plaque

Ans: b

2. We must floss your teeth 

a. every month

b. everyday

c. every week

Ans: b

3. Sweets and chocolates ____ our teeth .

a. spoil

b. perfect

c. clean

Ans: a

4. Tooth decay causes

a. toothache

b. holes in teeth

c. both

Ans: c

5. Molars are also called

a. tearing teeth

b. cutting teeth

c. grinding teeth

Ans: c

6. The centre of each tooth is called 

a. dentine

b. pulp

c. crown

Ans: b

B. Fill in the blanks :

1. We must brush your teeth at least twice a day .

2. Milk has calcium that makes our teeth strong.

3. We must wash or floss your teeth everyday. 

4. Microbes are very small living things.

5. Microbes that cause diseases are called germs .

C. Write T' for true or 'F' for false statements : 

1. We all are born without teeth.

True

2. Every adult has a set of 36 teeth. 

False

3. There are three kinds of permanent teeth. 

False

4. We should avoid too many sweets and chocolates. 

True

D. Match the columns:

1. Child - 20 teeth 

2. Adult - 32 teeth

3. Molars - 6 in each jaw

4. Premolars - 4 in each jaw

Answer the following questions :

1. Name the instrument which is used to see microbes.

Ans: The microscope is used to see microbes .

Microbes are very small living things . They can be seen only through a microscope .

2. Name the microbe that causes ringworm.

Ans: The microbe that causes ringworm is fungi .

3. What are microbes?

Ans: Microbes are very small living things can be seen only through  a microscope . Microbes can be found in air , water, soil, food and also inside and outside the bodies of plants and animals .

4. What are germs?

Ans: Microbes that cause diseases are called germs .

For example : bacteria (which cause typhoid , diphtheria, pneumonia etc) , 

viruses (which cause polio, influenza) ,

fungi  and protozoa .

5. What are temporary teeth?

Ans: By the age of three the child has a set of 20 teeth . 

This set of teeth is called temporary teeth because at the age of six the child start to losing these milk teeth  .

6. How are teeth important to us ?

Ans: Teeth are very important to us because 

Teeth provide us shape to our face .

Help us to bite and chew food .

Help us to speak clearly .